Elevator safety device.



No. 795,875. PATENTED AUG. ll, 1905.. Y

E. W. A. WIESEBROGK.

ELEVATOR SAFETY DEVICE.

APPLIoATIoN FILED oGT.a1.19o4.

2 SHEETS-SHEET 1.

GMU-human PATENTED AUG. 1, 1905. F. W. A. WIESEBROCK.

ELBVATOR. SAFETY DEVICE. APPLIOATION FILED 0011.31.1904.

UNITED STATES PATENT omnes.

FREDERICK WILLIAM A. VVIESEBROCK, OF NEW YORK, N. Y.

ELEVATOR SAFETY DEVICE.

ria. 795.875

Specification of Letters Patent.

Patented Aug. 1, 1905.

Application filed October 31, 1904. Serial No. 230,862.

T0 a/ZZ whom, it may concern:

Be it known that I, FREDERICK WILLIAM A. WIEsEBRooK, a citizen of theUnited States, residing at New York, county of New York, and State ofNew York, have invented new and useful Improvements in Elevator SafetyDevices, of which the following is a specification.

It is the obj ect of this invention to provide new and novel means ofsafety devices for elevators whereby the elevator-car is held inposition in case of accidental derangement of the hoisting machinery orthe parting of the hoisting-ropesafety devices which are always inposition to act.

The invention consists in the several novel features of construction andnew combination of parts hereinafter fully set forth and thenspecifically pointed out in the claims following this specification.

Referring to the accompanying drawings, Figure 1 is an elevation of anelevator containing my invention. Fig. 2 is a plan View of the top,showing the arrangement of the sheave and locking device. Fig. 3 is across section of elevator on line a, b.' Fig. 4 is a part of the uprightguard with incline plane.

In the said drawings the reference-numeral 1 denotes the car of theelevator. 2 and 2 are the sleeves attached to the car sliding on theguards 3 and 3, having projecting inclined planes 4 and 4. Guards 3 and3 are preferably made of hollow cylinders mounted at the bottom onroller-bearing platforms 5 and 5 and supported sidewise at intervals bybrackets 6 and 6, fastened to the side structure of the elevator-shaft.Said brackets 6 and 6 are flush with the outside diameter of thecylindrical guards 3 and 3 to allow the ready passage of the sleeves 2and 2, attached to the car. The sleeves 2 and 2 of the car are alsoprovided with grooves fitting the inclined plane of the guard. Theframes of the sleeves 2 and 2 are also provided with grooves 7 and 7',sliding straight up and down on the I-beams 8 and 8, fastened to thestructure of the elevator-shaft.

9 is the counterweight to the hoisting appliance.

To the rigid platform 10 at the to of the elevator-shaft is fitted inbearings t e shaft 13 with sheave 11, carrying hoisting-ropes 12. Onthis same shaft 13 is also fitted the feathers the worms 18 and 18,which are held in place by spiral springs 19 and 19, which springs inturn are held in place by collars 20 and 20. The worms 18 and 18 meshinto the worm-gears 21 and 21, which are rigidly keyed to theguard-cylinders 3 and 3.

The operation of the apparatus is as follows: After the different partsof the elevator are placed in position and hoisting machinery connectedto the car in the proper manner and the elevator set in motionthe ropeover sheave 11 will by rotating the sheave also rotate the spur-Gearing14 and 15, which in turn rotates the shaft 16 and by means of the wormand worm-gearingV also rotates the cylindrical guards 3 and 3. Theproportion of the spur-gear 14 to the pinion 15 is such that thedistance traveled by the car corresponds exactly to the rotation ofguards 3 and 3, with their inclined plane or liange 4 engaged in sleeve2, attached to the car. In fact, the sleeve 2, attached to the car,forms, as it were, the nut to a screw-bolt, (represented by the guard3.)

To provide for any slipping or stretching of the rope over the sheave,whereby the juxtaposition of the car to the guard 3 would bedisarranged, the worms 18 and 18 are adjusted to the shaft by means offeathers and are held in place by spiral springs 19 and 19', which willby their elasticity adjust the worms according to the different strainsexerted by such slipping or stretching of thevrope.

The projecting inclined planes 4 of the guards 3 and 3 sliding incorrespondinglyformed inclined grooves in sleeves 2 and 2 of the carallow the free passage of the car up and down as long as thehoisting-rope engages and rotates the sheave 11 5 but the mo- Inent therotation of the sheave 11 is interrupted by a breakage of the rope,whereby the adhesion of the rope to the sheave is destroyed, the rotarymotion of the shaft 16 is stopped, locking the cylindrical guards 3 and3 instantaneously and holding the car where it is at such time located,preventing its falling down the elevator-shaft.

What I claim, and desire to secure by Letters Patent, is-

1. In an elevator, the combination of a car or platform, spirallygrooved sleeves attachedthereto, spirally-flanged upright rotatableguards in said sleeves, worm-gears secured to said guards, a shaft,worms on the shaft and meshing with said worm-wheels, a second shaft, asheave thereon, a rope connected to the car and passing over thesheave,and gearing between the said shafts, whereby the operation of the sheavecauses a corresponding operation of the guards, substantially as setforth.

2. In an elevator, the combination of a car or platform,spirally-grooved sleeves attached thereto, spirally-flanged uprightrotatable guards in said sleeves. worin-gears secured to said guards, ashaft, worms movably secured on the shaft b y means of springs andcollars and meshing with said worin-wheels, a second shaft, a sheavethereon, a rope connected to the car and passing over the sheave, andgearing between the said shafts whereby the operation of the sheavecauses a corresponding operation of the guards, substantially as setforth.

3. In an elevator the combination of a car or platform, spirally-groovedsleeves attached thereto, spirally-ilanged upright rotatable guards insaid sleeves, worm-gears secured to said guards, side brackets fastenedat proper intervals as bearings for these guards, a shaft, worms on theshaft movably secured, and meshing with said worm-wheels, a secondshaft, a sheave thereon, a rope connected to the car and passing overthis sheave, and gearingbetween the said shafts, whereby the operationof the sheave causes a corresponding operation of the guards,substantially as set forth.

4. In an elevator the combination of a car or platform, spirallygroovedsleeves attached thereto, spirally-flanged upright rotatable guards insaid sleeves, worin-gears secured to said guards, side brackets andballbearing steps as bearings for said guards, a shaft, worms on theshaft, movably secured, and meshing with said worm-wheels, a secondshaft, a sheave thereon, a rope connected to the car and passing overthe sheave, and gearing between the said shafts, whereby the operationof the sheave causes a corresponding opcration of the guards,substantially as set forth.

5. In an elevator, the combination of a car or platform,spirally-grooved sleeves attached thereto provided with grooves for thestraight guide-bars, spirally-lianged upright rotatable guards in saidysleeves, worm-gears secured to said guards, a shaft, worms on the shaftand meshing with said worm-wheels a second shaft, a sheave thereon, arope connected to the car and passing over the sheave, and gcaringsbetween the said shafts, whereby the operation of the sheave causes acorresponding operation of the guards, substantially as set forth.

6. In an elevator, the combination of a car or platform,spirally-grooved sleeves provided with grooves for the straightguidebars attached thereto, spirally-flanged upright rotatable guards insaid sleeves, wormgears secured to said guards, a shaft, worms movablysecured to the shaft and meshing with said worm-wheels, a second shaft,a sheave thereon, a rope connected to the car and passing over thesheave, and gearing between the said shafts, whereby the operation ofthe sheave causes a corresponding operation of the guards, substantiallyas set forth.

7. In an elevator, the combination of a car or platform,spirally-grooved sleeves provided with grooves for the straightguidebars attached thereto, spirally-flanged npright rotatable guards insaid sleeves, wormgears secured to said guards, side brackets andstep-journals, as bearings for said guards, a shaft, worms on the shaftand meshing with said worin-wheels, a second shaft, a sheave thereon, arope connected to the car and passing over the sheave, and gearingbetween the said shafts, whereby the operation of the sheave causes acorresponding operation of the guards, substantially as set forth.

S. In an elevator, the combination of a car or platform,spirally-grooved sleeves provided with grooves for the straightguidebars attached thereto, spirally-'Ilanged npright rotatable guardsin said sleeves, wormgears Secured to said guards, side brackets andstep-journals as bearings for said guards, a shaft, worms movablysecured to the shaft and meshing with said worin-wheels, a second shaft,a sheave thereon, a rope connectcd to the car and passing over thesheave. and gearing between the said shafts, whereby the operation ofthe sheave causes a corresponding operation of the guards, substantiallyas set forth l In testimony whereof I have signed my name to thisspecification, in the presence of two subscribing witnesses, this' 24thday of October, 1904.

FltEDlllUf/K WILLIAM A. WIESEBROCK.

Vitnesses Ro'r. T. GIBoNs, F. C. BERTnoUD.

